package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.lang.annotation.Annotation;

@Component
@Slf4j
public class AuthorizeFilter implements Order, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登陆
        if (request.getURI().getPath().contains("/login/login_aut")){
            //放行
            return chain.filter(exchange);
        }
        //3获取token
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if (StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        try {
            //5.判断token是否有效
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //5.1是否过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result==1||result==2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return  response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return  response.setComplete();
        }

        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int value() {
        return 0;
    }

    /**
     * Returns the annotation type of this annotation.
     *
     * @return the annotation type of this annotation
     */
    @Override
    public Class<? extends Annotation> annotationType() {
        return null;
    }
}
